Digilent DDR-2 Opus Card - Manual (Page 2)

Opus Card – DDR-2 Interface
Reference Manual
Table of Contents
12/03/2010 07:35 AM 2 Copyright © 2009-2010 by CML
1. INTRODUCTION ..................................................................................................................................................3
1.1 D EBUG R EGISTERS A CCESSIBLE BY THE CPU .....................................................................................................3
1.2 C ONFIGURATION R EGISTER A CCESSIBLE BY THE CPU........................................................................................3
1.3 E NDIANNESS ........................................................................................................................................................3
1.4 DDR-2 M EMORY A CCESSIBLE BY THE CPU .......................................................................................................4
2. STATE MACHINE FOR WRITING DATA TO MEMORY.............................................................................5
2.1 S IGNAL D EFINITIONS ...........................................................................................................................................5
2.2 W RITE S TATE M ACHINE ......................................................................................................................................6
2.3 W AVEFORMS .......................................................................................................................................................7
2.3.1 Non-burst, 32-bit Memory Write .................................................................................................................7
2.3.2 Non-burst, 64-bit Memory Write .................................................................................................................8
2.3.3 Burst Memory Write - Four 32-bit Words ...................................................................................................9
2.3.4 Burst Memory Write - Eight 32-bit Words.................................................................................................10
2.3.5 Burst Memory Write – Two 64-bit Words..................................................................................................11
2.3.6 Burst Memory Write - Four 64-bit Words .................................................................................................12
3. STATE MACHINES FOR READING DATA FROM MEMORY..................................................................13
3.1 S IGNAL D EFINITIONS .........................................................................................................................................13
3.2 R EAD S TATE M ACHINE .....................................................................................................................................14
3.2 R EAD FIFO S TATE M ACHINE ............................................................................................................................15
3.3 W AVEFORMS .....................................................................................................................................................16
3.3.1 Non-burst, 32-bit Memory Read Clock-Aligned ........................................................................................16
3.3.2 Non-burst, 32-bit Memory Read not Clock-Aligned ..................................................................................17
3.3.3 Non-burst, 64-bit Memory Read ................................................................................................................18
3.3.4 Burst Memory Read - Four 32-bit Words ..................................................................................................19
3.3.5 Burst Memory Read - Eight 32-bit Words .................................................................................................20
3.3.6 Burst Memory Read - Two 64-bit Words ...................................................................................................21
3.3.7 Burst Memory Read - Four 64-bit Words ..................................................................................................22